Standing Sound Waves: An organ pipe of length L that is open at one end resonates in its third harmonic with a wavelength of 2L/3. Is the other end of the pipe closed or open?
A. closed
B. open
C. We cannot tell from the information provided.
Answer: B
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The ________ is the totality of all space, time, matter, and energy
Fill in the blank(s) with correct word
The resistance of a 50 watt bulb is ________ that of a 100 watt bulb, if both run on the same voltage.
A. double B. one half C. four times D. one fourth
A certain part of the electromagnetic spectrum ranges from 200 nm to 400 nm. What is the highest frequency associated with this portion of the spectrum? (c = 3.00 × 108 m/s)
A) 1.50 × 1014 Hz B) 7.50 × 1013 Hz C) 7.50 × 1014 Hz D) 7.50 × 1015 Hz E) 1.50 × 1015 Hz
Protostars are difficult to observe because
a. the protostar stage is very short. b. they are surrounded by cocoons of gas and dust. c. they radiate mainly in the infrared. d. all of the above e. they are all so far away that the light hasn't reached us yet.